We used to have a really daft rule that required light aircraft instruction to use licenced aerodromes, although microlight instruction didn't. After years of absolutely no difference in training fatalities between the two, the rule was finally removed for light aircraft training, and within a year a large number of training airfields had got rid of their licences and saved a lot of money and effort
This has been a two edged sword.
Training organisations have also begun to decamp from licensed airfields (which need to remain licensed for public transport flights) in order to save money by moving to unlicensed fields. This can threaten the viability of existing licensed fields and we are already losing enough airfields without making matters worse.